Invisible earphone detection device and method

Abstract

Provided is an invisible earphone detection device and method. The invisible earphone detection device comprises a first magnetic sensor, a second magnetic sensor and a power key switch module, wherein the first magnetic sensor and the second magnetic sensor are connected with an A / D conversion module through an amplifier circuit, the A / D conversion module is connected with a master control module, the first magnetic sensor and the second magnetic sensor are connected with the master control module through an S / R setting reset circuit, and the master control module is connected with a LCD display module and a sound and light alarm module. The invisible earphone detection device is high in sensitivity, small in size, good in operability and low in misjudgment rate, and cannot interfered by an external magnetic field, a probe cannot be easily damaged by a strong magnetic field, and the invisible earphone detection device is high in reliability and easy to maintain.

Description

technical field [0001] The invention relates to a non-contact detection device, in particular to an invisible earphone detection device and a detection method. Background technique [0002] Because of its small size, light weight, and convenience for concealed use, invisible earphones have become a common means of cheating in exams, illegal monitoring, and fraud. Especially in recent years, the use of invisible earphones for cheating in exams has become increasingly rampant, seriously undermining the fairness of exams, and bringing great troubles to exam administration. [0003] Invisible earphones mainly include rare earth type and electronic type: rare earth type invisible earphones mainly rely on strong magnetic materials, mainly NdFeB magnets, which vibrate the ear canal through the induction vibration of the audio magnetic field to make the wearer hear the sound; electronic earphones mainly The induced electromotive force obtained by the coil in the audio magnetic fiel...

AI Technical Summary

Problems solved by technology

Traditional electromagnetic wave detection dog equipment can detect electromagnetic waves well, but when the wearer does not turn on the earphones, this detection device cannot effectively detect

In addition, due to problems such as oversensitivity and poor positioning of electromagnetic wave detection dogs, it is difficult to determine what the signal is and where it comes from

Chinese Patent "Invisible Earphone Detector and Detection Method" Patent No.: 200510136083.8, using active electromagnetic waves to monitor reflected electromagnetic wave signals, this method has low signal-to-noise ratio, complex circuit design, and is susceptible to environmental interference

The current magnetic field of rice earphones is also around 10Gs. Therefore, using this method to detect invisible earphones, only when the magnetic sensitive switch touches the rice earphones can an effective signal be obtained, which has no practical value.

Simply improving the sensitivity of the detection device, due to the influence of the geomagnetic field, it is difficult to effectively detect the invisible earphones that are carried around, and the probability of misjudgment is very high

[0008] Based on the limitations of the above monitoring methods, in order to effectively detect invisible earphones, it is urgent to develop a new detection device and method, which is cost-effective and easy to operate, and can be popularized and applied to examination sites to effectively prevent the abuse of invisible earphones

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